Device for forming beads in sand molds



(No Model.)

C. B. ISBESTER.

DEVICE EOE EOEMENG BEADS IN SAND MOLDS. No. 373,664. Patented Nov. Z2, 1887.

UNITED STATES Artnr @reina CALEB B. 'ISBESTER, OF CHATTANOOGA, TENNESSEE.

DEVICEFOR FVORNHNG BEADS IN SAND MOLDS.

SPECIFICATION forming part of Letters Patent No. 373,664, dated November 22, 1857.

Application filed October 4. ISST. Serial No. 251,455. (No model.)

To @.ZZ whom z5 may concern.-

Be it known that l, Carne B. lsnns'rnn, a citizen of the United States, residing at Chattanooga, in the county of Hamilton and State of Tennessee, have invented certain new and useful Improvements in Devices for Forming Beads in Sand Molds; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This .invention is designed as an improvement upon the devices for forming beads in sand molds patented to me June 29, 1886, and August 2,3, 1887. I

The main object of this invention is to lessen the friction upon the bead-forming devices by substituting rolling for sliding contact, and to thus also reduce their wear and increase their power of operation.

Aiurthcr object is to provide a device which will more eii'ectually form an internal bead without additional expense of manufacture or power to operate, anda further object isA to adapt the parts for quick operation, and to so arrange them that any of them may be easily and quickly removed and replaced without impairing the usefulness of the others.

These several objects are accomplished by the means shown and illustrated in the accompanying drawings, in which- Figure l is a horizontal sectional View of my improved device, taken in the plane indicated by the dotted lines Z Z of Fig. 5. Fig. 2 is aview of the ring-levers `for operating the bead-forming rollers. Fig. 3 is a cross-sec` tional view ofthe operatingshaft, showing one of the eccentrics thereon. Fig. 4 is a horizontal sectional view taken on the plane indicated by the dotted lines 3/ y of Fig. 5, and Fig. 5 is a vertical diametrical sectional view taken on the line indicated by the lines r x of Fig. 4.

Referring by letter to the said drawings, A indicates the cylindrical casing, which is of a diameter to correspond with the internal diameter of the sand mold into which it is to be introduced. This casing has the base of its vertical walls cut away at diametricallyopposite points, as shown at a a, for the passage of the head-forming rollers, as will be presently explained. The base-plate B of this casing is also cut away at diaxnetrical points, as shown at b, for a similar purpose, and this plate or crosspicce is provided with a marginal rectangular flange, as shown, whereby the same is secured to the inner wall of the casing. This cross-piece B is also provided with a central vertical aperture, c, for the passage of the lower end of the operatingshai't, the same being secured therein by means of a nut or other suitable device.

G indicates the upper or guide piece, which is also provided with a central aperture to receive the operating-shaftand marginal flanges to secure it to the casing. This cross-piece C is provided near opposite ends with elongated slots d d, designed to receive and guide the studs or journals of the bead-forming rollers, the saine being controlled in their movements by yokes or levers encircling the eccentric, as will be presently set forth.

On the operating-shaft E, and preferablyv formed integral therewith, are two oppositclydirected eccentrics, e e, around which are yokes F, having lever-arms G, which are provided at their outer ends with verticallydisposed eyes g.

H indicates vertical studs or journals for the bead-forming rollers. These studs pass through the elongated slots in the upper crosspiece, and are sustained therein by nuts h, which cross the said slots. On the lower side of these studs are arranged the head-forming rollers l, the arms or levers ofthe yoke bearing slightly upon the upper sides thereof, so as to hold them down in position when re tracted. The peripheries of these bead-forniing rollers are of a forni corresponding to the form ofthe groove or bead tobe made in the sand mold, and they are designed to rotatel during the operation ofthe device in forming the bead. It will thus be seen that while there is but little friction on these rollers, yet they will as perfectly form a bead as the slideblocks heretofore used. It will also be seen that by reducing the friction at this point it will require 1n uch less force to operate the device, and the consequent lessenin g of wear will prolong the usefulness of the parts.

K indicates a collar on the operatingshaft,

which is designed to prevent the yoke from leaving the lower eccentric, and this shaft is ICO also provided with another collar, i, for retaining said shaft in proper position.

In operation the shaft is to be turned so as to retract the rollers Within the casing, and such will be effected when the studs of the said rollers strike the inner end wall of the guideslots in the upper cross-piece. The casing is then let into the sand mold until prop erly seated on the chill-plate7 when the shaft is turned in the opposite direction until the said studs strike the outer end walls of the said slots, when the rollers will be protruded to the proper point. The operator may then continue to turn the shaft until the bead has been formed.

Having described my invention, what I claim 1. The combination, with a cylindrical cas- 2. The combination, with a cylindrical casing recessed to receive formers, of a shaft having oppositely-directed eccentrics thereon and yoke-levers encircling the said eccentrics and carrying rollers at their outer ends, whereby the rollers may be protruded and retracted, substantially as specified.'

3. The combination, with a cylindrical casing recessed to receive formcrs, of a crosspiece having guide-slots, the operating-shaft having oppositely directed eccentrics, and yokellevers encircling the eccentrics and having studs guided in the slots and bearing beadformers, substantially as specified.

In testimony whereof I afx my signature in` presence of two witnesses.4

CALEB B. ISBESTER.

Vitnesscs:

M. LLEWELLYN, C. J. HARRINGTON. 

